Fukler

The Fuller House star announced the news on Instagram, revealing he and wife Caitlin McHugh have welcomed a son. Born at 8:32 p.m., William Christopher Stamos arrived on Tuesday, April 10 in Los Angeles, PEOPLE confirmed via his birth certificate.

“From now on, the best part of me will always be my wife and my son. Welcome Billy Stamos (named after my father),” Stamos, 54, captioned a photo of the newborn nestled on his chest. “#NotJustanUncleAnymore #Overjoyed”